(57) A vehicle drivetrain (16) disclosed includes a viscous clutch (30) that is driven
by an auxiliary output (52) of a transaxle (28) to provide four-wheel driving when
needed while providing two-wheel driving at other times. A selector (54) is preferably
incorporated to selectively a) disconnect the auxiliary output (52) of the transaxle
from the pair of wheels not normally driven thereby, b) connect the auxiliary output
(52) of the transaxle to the second pair of wheels through the viscous clutch (30),
or c) connect the auxiliary output (52) of the transaxle to an output (60) of the
viscous clutch (30) in a bypassed relationship to the clutch. The drivetrain (16)
has particular utility when utilized with a transversely mounted front engine and
can be utilized with a transaxle (28) of either the automatic or manual shifting type.
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